Trip cock device



Sept. 22, 1936.

C. C. FARMER TRIP COCK DEVICE Filed June 10, 1933 INVENTOR I CLYDEQFARMER llll BY W - ATTORNEY Patented Sept. 22, 1936 UNlTEDi STATQE TRIPCOCK DEVICE I Clyde CQFarmer,

Westinghouse Air Pittsburgh; Pa., assignor to The Brake Company,Wilmerding, Pa., a corporation of Pennsylvania Application June 10,1933, Serial No. 675,212

6 Claims. (01. 251-39) This invention relates to trip valve devicesadaptedto be operated by a trip or obstruction along the track forventing-air from the brake pipe to effect an application of the brakes;

The principal object of my invention is to provide an improved tripvalve device of the type in which the valve for venting -fiuid underpressure from the brake pipe is held closed by mechanical means and theopening of the valve is ensured by the action of mechanical means so asto obtain a device which-is positive in action.

In the accompanying drawing, Fig. l is an elevational view of a tripvalve device embodying theinvention; Fig. 2 is a sectional view on theline 2-2 of Fig.1; Fig. 3 is a sectional view on the line 33 of Fig. 2;Fig. 4 is a sectional View on the line 4-4 of Fig. 2; and Fig; 5is asectional view on the line 5-5 of- Fig. 4.

As shown in the drawing, the trip valve device comprises a casinglhaving a bore 2, open at one end and lined with a cylindrical bushing3. The open end of the bore 2 isclosed by a cover 4, and the bore isconnectedthrough the cover 4 to a brake pipe 32 and through a pluralityof outlet openings 6 in the bushing 3 to an exhaust chamber 1 partiallysurrounding the exterior surface of the bushing 3, the exhaust chamber 1being open to the atmosphere throughtwo downwardly directed passages 8.1

A valve 9 is slidably mounted in the bushing 3, and a ring gasket [0,having a; flange ll clamped between oneend of the bushing 3- and thecover 4, is adapted to be engaged by said valve for closingcommunication from the brake pipe chamber 5 at the upperside of saidvalve to the openings 6 and'thence to the atmosphere. v

The valve 9 is provided with *a=hollow, cylindrical skirt portion l2slidably engaging the bushing 3, and diametrically opposite openings I3are provided through said skirt portiont Similar diametrically oppositeopenings M are provided through the bushing 3 in alignment at one sidewith a bore through the wall of casing l and at the opposite side withabore 5 provided in a bearing member I! secured to the casing l byscrew-threaded engagement.

A rotatable member [8 extends through the openings l3 in the skirtportion 12 of the valve 9 and the aligned openings M in the bushing '3.One end of the member I8 is rotatably carried'in bore It in thebearingmember ll while the other end is rotatably carried in bore IS in thecasing and extends through bore l5 to the outside of the casing. A triparm 19 is secured to the end of the rotatable member l8 outside of 'thecasing for turning said member. l

Within the skirt portion l2 of the valve 9, the member I8 is bent toform a crank arm 34, and on the extreme outer surface of said crank .armis provided a flat surface 20 .which is at right angles to a linepassing through-the axis ofrotation of member [8 and through the centerof said crank arm, so as to provide a locking means for said valve inthe dead center position of said crank arm. A wear insert 2| is providedin the lower face of the valve 9 and is adapted to be engaged by thefiat surface 20 ofthe crank arm 34 for urging the valve 9 into sealingengagement with the gasket Ill. The outer end of the valve skirt [2 isprovided with a bore in which is secured awear member by means of a pin33, said wear member being adapted to be engaged by the crank 34 forpulling the valve out of engagement with gasket'lll. oppositely disposedflatosurfaces 22 and 23 are provided in parallel planes on the crank 34at right angles to the flat surface 29.- The surface 22 is adapted to beengaged by the insert 2|, to define the open position of the valve 9when the trip arm l9 and therefore crank 34 is turned in one direction,while the surface 23 is adapted to be engaged by the insert 2| if thetrip arm I9 is turned in the oppositedirection. 7 M l t l r A'lug2lprojects from the casingat each side of the trip arm [9 in the plane ofrotation thereof and each of the lugs 21 is provided with a bore inwhichis secured an insert 28 ofrubber or the like by means of a cotter pin 29extending through the insert and the side walls of the lug 21; so thatupon rotation of the trip arm I9 in either direction said arm will beresiliently stopped by engagement with one or the other of the in-'serts-28. l

The bore 2 is preferably closed at the lower end toprevent entrance ofdirt or otherforeign matterto the operatingmechanism within the bushing3, but'to permit drainage of moisture which maycollect in said bore, thecasing is provided with an opening at the lowest point of the .bore,said openingbeing normally closed by a'pipe plug '39. Suitable brackets3 l are formed integralswith casing l for mounting the trip valve devicewhere desired v V j L; Y

In operatiomthe triparm I9 is normallycar- "riedin a; vertical positionas shown in Figs. 1, 2, and 4. In this vertical-position the flatsurface 20 on the crank-34 is in engagementlwith the hat surface on thewear insert 2| and thereby firmly holds-the valve!) in sealingengagement with the .gasket from the brake pipe 32 to chamber 5 abovesaid .valve can not escape past said valve. It will be evident that thevalve 9 is automatically held in the. -closed position just describedbecause rotationof the crank. arm 34 from its. dead center holdingposition can not be effected without elevating the wear member 21' andvalve 9 against the gasket l0 and thepressure of fluid acting on saidvalve over" the area withinsaid gasket. vIf. the triparm :l9 ;is struck.by a trip or other [0, so that fluid under pressure. suppliedobstruction along the trackway, said arm is caused to turn the member l8in either one direction or the other according to which side of said armis struck, and such turning is limited by engagement with one or theother of the cushioning inserts 28, as shown in Fig. 3.

The turning of the member l8 in either direc tion turns the crank arm 35 out of engagement with and away from the insert 2| so that brake pipepressure acting on the valve 9 in chamber 5 acts to move saidvalve"downwardly'until'the insert 2| engages either surface 22 'or'surface 2'3 on said member, accordingto the, direction of rotation ofthe trip arm. In this position of the valve 9, fluid under pressure isvented from the brake pipe 32 through chamber 5, openings 6 in bushing3, chamber 1 and from thence to the atmosphere through passages 8.

In ;case the valve 9 sticks to the gasket ID or for some other reasonbrake pipe pressure in chamber 5 is unable to move said valve away fromsaid gasket when the crank arm 34 is turned out of engagement with,,wearmember 2| in said valve, then said crank arm engages the surface 24 onthe member 25, as the crank arm is rotated, and mechanically acts toshift the skirt [2 downwardly and thereby pull said valve away from thegasket 10, After said valve is pulled away from gasket I0, said valve ismoved downwardly by brake pipe pressure to the open position as definedby engagement of insert 2i with either surface 22 or 23 on said member,according-to the direction of rotation of said member. Whenthe tripvalve device is operated as above described torvent the brake pipe 32,the pressure of fluid acting on the valve 9 during the ventingoperation, acts to hold said valve wide open, but after the brake pipeis fully vented, the weight of the arm l9 may cause the valve -9 to bemoved toward the gasket N1. ,7 However, in order to ensure the fullclosure of the valve '9, or resetting of the device, the trip arm 19must be manually moved to the vertical position.

It will be. evident that the trip valve device is positive in actionsince it is moved andheld in its closed position by mechanical means andthe operation of said valve device to vent fluid under pressure from thebrake pipe is ensured by the actionof mechanical means. 7

While one illustrative embodiment of the in- Vent-ion ha-sheende'scribedin detail, it is not my intention to limit its scope to thatembodiment or otherwise than by the terms of the :appended claims.

Having now described my invention, what I claim as -'new' and desire .tosecure %by Letters Patent is: K

1. In combination, a brake pipe adapted to be normally chargedwith fluidunder pressure, "and a trip valve device operative to vent =fluid underpressure from said'brake pipe, said trip valve device comprising a:casing, a valve seat :in said casing, a valve positioned in said casingand -reciprocally "movable into and :out :of engagement ,with'the saidseat, a movable member associated with said 'valve and movable between avalve closed and a valve open position and having a cam surface thereonand engageable with an operating surface associated with the valve whenthe said member is in the valve closed position for holding "the valvein engagement with said seat and for opposing movement :of said memberaway from the said va'lve'closed position, the valve being urged intoengagement withithe cam :su'rface onsaidmovable memberibythe:fluid'imder pressure in the brake pipe, said valve having anotheroperating surface associated therewith and adapted to be engaged by acam surface on said movable member to effect movement of the valve fromthe closed position to the open position by said movable member onmovement of the said member from the valve closed position towards thevalve open position, and a trip arm for operating said movable member.

2. In combination, a brake pipe adapted to be normally charged'withfluid under pressure, and a'trip valve'devic'e operative to vent fluidunder pressure from said brake pipe, said trip valve device comprising acasing, a valve seat in said casing, a. valve positioned in said casingand reciprocally movable into and out of engagement with said seat, amovable member associated with said valve and movable between a valveclosed and a valve open position and having a cam surface thereon :andengagea-ble with an operating surface associated with the valve when thesaid member is in the'valve closed position for holding the valve inengagement with said seat and for opposing movement of said member awayfrom the said closed position, said movable memher having another camsurface thereon adapted to be engaged by the said operating surface onthe valve when said member is in the open position, the valve beingurged into engagement with the cam surfaces on said movable member bythe fluid under pressure in the brake pipe, said valve having anotheroperating surface associated therewith and adapted to be engaged by acam surface on said movable member to effect movement of the valve fromthe closed position to the open position by said movable member onmovement of the said member from the valve closed position towards thevalve open position, and a trip arm for operating said movable member.

3. In combination, a brake pipe adapted to be normally charged withfluidunder pressure, and a trip valve device operative to vent fluid underpressure from said brake pipe, said trip valve device comprising acasing, a valve positioned in said casing, a valve seat said casing andcomprising a body formed of resiliently yieldable material, the valve:being movable between a valve closed position in which it engages thevalve seat and displaces the body thereof, and a valve open position inwhich it is .0111, of engagement with the said valve seat, a movablemember associated with said valve and movable between a valve closed anda valve @open position and having a cam surface thereon and engageablewith an operating surfaceassociated with the valve when the said memberisin thevalve closed :positionjfor ihol'dmg rthe valve in engagementwith said .seat and for opposing movement ,of said .member away fromsaid valve closed position, the valve being urged into engagement withthe cam surface on :said :m-ovable mom-ber by the fluid under pressurethe :brake pipe, said valve having another operating surface .associatedtherewith and adapted to "be engaged by a .cam surface on :said movablemember to effect movement of the valve from the closed .position to theopen position by said movable member .on movement of said member fromtheyal-ve (closed position towards the valve open position, and a :triparm for operating isaid movable member.

4. In combination, .a brake =pipe adapted to be normally-charged withfluid under pressure, and a trip valve rdevice operative :to vent fluidunder pressure from'zs'aid'ibrake pipe, .said trip valve devicecomprisinga lcasi-ng,.a valve seat in :said casing, a valve positionedin said casing and reciprocally movable into and out of engagement withthe said seat, a movable member associated with said valve and movablebetween a valve closed and a valve open position and having a camsurface thereon and engageable with an operating surface associated withthe valve when the said member is in the valve closed position forholding the valve in engagement with said seat and for opposing movementof said member away from the said valve closed position, the valve beingurged into engagement with the cam surface on said movable member by thefluid under pressure in the brake pipe, said valve having anotheroperating surface associated therewith and' adapted to be engaged by acam surface on said movable member to effect movement of thevalve fromthe closed position to the open position by said movable member onmovement of the said member from the valve closed position towards thevalve open position, a trip arm for operating said movable member, andstop means cooperating with said casing and said lever for limiting theover-travel of the said lever at a distance beyond the valve openposition.

5. In combination, a brake pipe adapted to be normally charged withfluid under pressure, and a trip valve device operative to vent fluidunder pressure from said brake pipe, said trip valve device comprising acasing, the casing havingvalve seat means associated therewith, valvemeans movable between a closed position in which it is in engagementwith said valve seat means and an open position in which it is out ofengagement with the said valve seat means, one of said means having anengaging face comprising a body constructed of resiliently yieldablematerial, a movable member associated with said valve and movablebetween a valve closed position and a valve open position and having acam surface thereon and engageable with an operating surface associatedwith the valve means when the said member is in the valve closedposition for holding said valve means in engagement with said seat meansand for opposing movement of said member away from said valve closedposition, the valve means being urged into engagement with the cam sur--face on the said movable member by the fluid under pressure in the brakepipe, said valve means having another operating surface associatedtherewith and adapted to be engaged by a cam surface on said movablemember to effect movement of the valve means from the valve closedposition to the valve open position on movement of said movable memberfrom the valve closed position to the valve open position, and a triparm for operating the said movable member.

6. In combination, a brake pipe adapted to be normally charged withfluid under pressure, and a trip valve device operative to vent fluidunder pressure from said brake pipe, said trip valve device comprising acasing, the casing having valve seat means associated therewith, valvemeans movable between a closed position in which it is in engagementwith said valve seat means and an open position in which it is out ofengagement with the said valve seat means, one of said means having anengaging face comprising a body constructed of resiliently yieldablematerial, a movable member associated with said valve and movablebetween a valve closed position and a valve open position and having acam surface thereon and engageable with an operating surface associatedwith the valve means when the said member is in the valve closedposition for holding said valve means in engagement with said seat meansand for opposing movement of said member away from said valve closedposition, the movable member having another cam surface thereon adaptedto be engaged by the said operating surface on the valve means when saidmember is in the valve open position, the valve means being urged intoengagement with the cam surfaces on the said movable member by the fluidunder pressure in the brake pipe,

said valve means having another operating surface associated therewithand adapted to be engaged by a cam surface on said movable member toeffect movement of the valve means from the valve closed position to thevalve open position on movement of said movable member from the valveclosed position to the valve open position, and a trip arm for operatingthe said movable member.

CLYDE C. FARMER.

